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          <h1 id="方法的重载与重写"><a href="#方法的重载与重写" class="headerlink" title="方法的重载与重写"></a>方法的重载与重写</h1><p><strong>这两个都是多态的一种表现形式。</strong></p>
<h2 id="重载"><a href="#重载" class="headerlink" title="重载"></a>重载</h2><ul>
<li>在同一个类中，允许存在一个以上的同名方法，只要它们的参数个数或则和参数类型不同即可</li>
<li>特点：与返回值类型无关，只看方法名和参数列表</li>
<li>在调用是，虚拟机通过参数列表的不同来区分同名方法</li>
</ul>
<h2 id="重写"><a href="#重写" class="headerlink" title="重写"></a>重写</h2><ul>
<li><p><strong>1、重写在方法运行时，通过调用者的实际类型来确定调用的方法版本。（具体细说，就是子父类中的重写方法在对应的class文件常量池的位置相同，一旦子类没有重写，那么子类的实例就会沿着这个位置往上找，直到找到父类的同名方法**</strong>）**</p>
<p>    <strong>2、重写只发生在可见的实例方法中：</strong></p>
<p>            <strong>1、静态方法不存在重写，形式上的重写只能说是隐藏。</strong></p>
<p>            <strong>2、私有方法也不存在重写，父类中private的方法，子类中就算定义了，就是相当于一个新的方法。</strong></p>
<p>            <strong>3、静态方法和实例方法不存在相互重写。</strong></p>
<p>    <strong>3、重写满足一个规则：两同两小一大</strong></p>
<p>            <strong>1、两同：方法名和形参列表一致</strong></p>
<p>            <strong>2、两小：重写方法的返回值（引用类型）和抛出异常，要和被重写方法的返回值（引用类型）和抛出异常**</strong>相同或者是其子类。注意，一旦返回值是基本数据类型，那么重写方法和被重写方法必须相同，且不存在自动拆装箱的问题。**</p>
<p>            <strong>3、一大：重写方法的访问修饰符大于等于被重写方法的访问修饰符。</strong></p>
<h1 id="java的跨平台性"><a href="#java的跨平台性" class="headerlink" title="java的跨平台性"></a>java的跨平台性</h1><p>JAVA的跨平台特性表述为“一次编译，到处运行”，JAVA程序运行在JVM上，而JVM对上屏蔽了底层操作系统差异。</p>
<p>Java的跨平台特性是因为JVM的存在， 它可以执行.class字节码文件，而不是.java源代码</p>
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          <p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>

<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>

<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>

<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>

<p>More info: <a href="https://hexo.io/docs/one-command-deployment.html" target="_blank" rel="noopener">Deployment</a></p>


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